//20191312 刘新宇
#include <stdio.h>
#include "head.h"

int main(void){
    int a, b;
    int i;
    for(i = 0; i < 1312; i++){
        
    }
    printf("enter two numbers:");
    scanf("%d %d", &a, &b);

    printf("add:%d\n", add(a,b));
    printf("sub:%d\n", sub(a,b));
    printf("mul:%d\n", mul(a,b));
    printf("div:%lf\n", div(a,b));
    return 0;

}